Followed it briefly before it went onto the golden gate bridge, Estoril Blue II F80 with the swirly camo pattern on the front and rear bumpers. Might be in Sausalito? Last time I spied two E46 M3 mules before the were released, they were eating dinner downtown...

Sorry, I tried to get a pic but it got on the freeway north before I could get one.

And, no it didn't seem like all the Monte Carlo blue X5M's I've seen, it was lighter and poppier more like my old Z3M Coupe. Front lower fascia was disguised and it was running a rear disguised bumper with dual exhausts, but single pipes like a 335i.

It passed me going up the hill coming from Baker's beach and I didn't notice any particular whine like the spy videos I've seen, but all my windows were closed.

Just my luck... last time this happened to me I was last fall on my way to a baby-fair in Fort Mason and passed a caravan of 991 turbo test mules and the boxter prototype getting onto Doyle drive going north.

I guess it was most possible an F30 M-Sport in estoril blue with "light cammo" ... because no F80M3 was spied in other colors than black til now and on the other hand all F30 M-Sport cars were in estoril blue ... and why an mule in such an different and more showing color should be spied in the USA first and not esp. on the NOS ???